Power storage pack authentication method, power storage pack, charging device, electric mobile body, and electric mobile body control device

ABSTRACT

A first power storage pack wiredly transmits identification information retained in the first power storage pack to a charging device when the first power storage pack is detached from an electric movable body. The charging device wiredly transmits the identification information received from the first power storage pack to a second power storage pack. The controller of the second power storage pack transmits via near-field communication a signal including the identification information received from the charging device. The electric movable body collates whether or not the identification information included in the received signal matches the identification information retained in the first power storage pack.

TECHNICAL FIELD

The present invention relates to a method of authenticating a powerstorage pack mounted in and detached from an electric movable body, apower storage pack, a charging device, an electric movable body, and acontroller for an electric movable body.

BACKGROUND ART

In recent years, electric motorcycles (electric scooters) and electricbicycles have become widespread. Usually, a portable battery packcapable of being mounted and unmounted is used in the electricmotorcycle or the electric bicycle. When a battery is used as a powersource of the motorcycle (scooter), a time required for energy supply islonger than a case where a liquid fuel such as gasoline is used (acharging time is longer than a fueling time).

Thus, when a state of charge of the battery pack decreases, it isconsidered that a mechanism for shortening the time required for energysupply is constructed by replacing a battery pack charged in advancewith a battery pack having a reduced state of charge at the nearestcharging stand.

Meanwhile, a method for confirming connection between a vehicle havingan electricity storage device mounted thereon and an external powersupply device by using wireless communication when the vehicle and theexternal power supply device are connected by a charging cable has beenproposed (see, for example, PTL 1).

CITATION LIST Patent Literature

PTL 1: Japanese Patent Laid-Open Publication No. 2011-125186

SUMMARY OF THE INVENTION Technical Problem

In the above method, it is assumed that the electricity storage deviceis fixed in the vehicle, and it is not assumed that the electricitystorage device is removed from the vehicle. On the other hand, in theabove mechanism involving the replacement of the battery pack, acircumstance in which there are a plurality of vehicles or a pluralityof chargers in a range in which wireless communication with the batterypack can be performed may occur.

Under such a circumstance, there is a possibility that a controller of acertain vehicle erroneously controls a battery pack mounted in anotheradjacent vehicle. There is a possibility that a controller of thecharger does not control the battery pack which is to be controlled andis mounted in a certain charging slot and erroneously controls thebattery pack which is not to be controlled and is mounted in anothercharging slot. In such a case, safety and security of the entirecharging system cannot be secured.

The present disclosure has been made in view of such a circumstance, andan object of the present disclosure is to provide a technique forcorrectly identifying a mounted power storage pack by an electricmovable body or a charging device that controls the power storage packby using wireless communication.

Solution to Problem

In order to solve the above problem, a power storage pack authenticationmethod includes: wiredly transmitting, by a controller of a first powerstorage pack, identification information retained in the first powerstorage pack to a controller of a charging device when the first powerstorage pack detached from an electric movable body is mounted in afirst charging slot of the charging device; wiredly transmitting, by thecontroller of the charging device, the identification informationreceived from the first power storage pack to a controller of a secondpower storage pack which is replaceable with the first power storagepack and which is mounted in a second charging slot; transmitting vianear-field communication, by the controller of the second power storagepack, a signal including the identification information received fromthe charging device when the second power storage pack detached from thesecond charging slot is mounted in the electric movable body; andcollating, by a controller of the electric movable body, whether or notthe identification information included in the received signal matchesthe identification information retained in the first power storage packafter the controller of the electric movable body receives the signaltransmitted by the near-field communication, and authenticating that thesecond power storage pack mounted in the electric movable body isidentical to a partner device communicating via the near-fieldcommunication when the identification information included in thereceived signal matches the identification information retained in thefirst power storage pack.

Advantageous Effect of Invention

According to the present disclosure, the electric movable body or thecharging device that controls the power storage pack by using wirelesscommunication correctly identify the mounted power storage pack.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a conceptual diagram of a vehicle system using a replaceablebattery pack according to an exemplary embodiment.

FIG. 2 is a diagram illustrating a configuration example of a chargingdevice according to the exemplary embodiment.

FIG. 3 is a diagram illustrating a configuration example of a vehicleaccording to the exemplary embodiment.

FIG. 4 is a diagram illustrating a system configuration example of abattery pack mounted on the vehicle and a vehicle controller accordingto the exemplary embodiment.

FIG. 5 is a diagram illustrating a basic concept of a process ofauthenticating, by a vehicle controller, the battery pack mounted in amounting slot of the vehicle.

FIG. 6 is a diagram schematically illustrating a flow of ID assignmentto the replaced battery pack when the battery pack mounted in themounting slot of the vehicle is replaced.

FIG. 7 is a sequence diagram illustrating a detailed process flow whenthe battery pack mounted in the mounting slot of the vehicle is replaced(part 1).

FIG. 8 is a sequence diagram illustrating a detailed process flow whenthe battery pack mounted in the mounting slot of the vehicle is replaced(part 2).

FIG. 9 is a sequence diagram illustrating a process flow according to amodification of the process illustrated in FIG. 8 .

DESCRIPTION OF EMBODIMENT

FIG. 1 is a conceptual diagram of vehicle system 1 using replaceablebattery pack 10 according to an exemplary embodiment. Vehicle system 1includes plural battery packs 10, at least one charging device 20, andplural vehicles 30 are used. In the present exemplary embodiment, anelectric motorcycle (electric scooter) is assumed as vehicle 30.

Battery pack 10 is a portable or replaceable battery pack capable ofbeing mounted and detached, and can be mounted in a mounting slot ofvehicle 30 and a charging slot of charging device 20. Battery pack 10 ischarged while being mounted in the charging slot of charging device 20.Charged battery pack 10 is taken out by a user (usually, a driver ofvehicle 30) and is mounted in the mounting slot of vehicle 30. Batterypack 10 mounted in the mounting slot of vehicle 30 is discharged duringtraveling of vehicle 30, and has a state of charge reduced accordingly.Battery pack 10 having the reduced state of charge is taken out by theuser and is mounted in the charging slot of charging device 20. The usertakes out charged battery pack 10 from another charging slot of chargingdevice 20 and mounts the charged battery pack in the mounting slot ofvehicle 30. Battery pack 10 having the reduced state of charge is thusreplaced with charged battery pack 10. As a result, the user does notneed to wait for the charging of battery pack 10, and can restart thetraveling of vehicle 30 in a short time.

In this method, since battery pack 10 is frequently mounted anddetached, deterioration of a connector of battery pack 10 contacting aconnector of the mounting slot of vehicle 30 or a connector of thecharging slot of charging device 20 easily progresses. As acountermeasure, in the present exemplary embodiment, a control signal istransmitted and received between battery pack 10 and each of vehicle 30and charging device 20 by wireless communication. As a result, aterminal for a communication line can be eliminated from a connector. Aterminal for a power line may be provided in the connector. In thepresent exemplary embodiment, since wired communication via theconnector is not used for the transmission and reception of the controlsignal, the control signal is prevented from being interrupted due to aconnector defect.

Near-field communication is used for wireless communication betweenvehicle 30 and battery pack 10, wireless communication between chargingdevice 20 and battery pack 10, and wireless communication betweenvehicle 30 and charging device 20. Bluetooth®, WiFi®, infraredcommunication, and the like may be used as the near-field communication.Hereinafter, in the present exemplary embodiment, it is assumed thatBluetooth® Low Energy (BLE) is used as the near-field communication.

The BLE is an extended standard of Bluetooth®, and is alow-power-consumption near-field communication standard using a 2.4 GHzband. Since the BLE has low power consumption such that the battery packmay be powered for several years with a single button cell, the batterypack is suitable for battery powering, and the influence on the state ofcharge of battery pack 10 may be almost ignored. Since a lot of modulesfor BLE communication are put in the market, the modules may be obtainedat low cost. The BLE has high affinity with a smartphone, and canprovide various services in cooperation with the smartphone.

When a general class II device is used, a radio wave coverage of the BLEis about 10 m. Therefore, plural vehicles 30, plural battery packs 10,and charging devices 20 may exist within a communication range of theBLE. Since the plural charging slots are provided in charging device 20,charging device 20 needs to wirelessly communicate with plural batterypacks 10 mounted in plural charging slots. That is, a 1:N network isestablished between charging device 20 and each of plural battery packs10. Similarly, in the case that plural mounting slots are provided invehicle 30, vehicle 30 needs to wirelessly communicate with pluralbattery packs 10 mounted in the plural mounting slots. That is, a 1:Nnetwork is established between vehicle 30 and each of the plural batterypacks 10.

Therefore, a mechanism for ensuring that battery pack 10 mounted in aspecific charging slot of charging device 20 is required to be identicalto battery pack 10 of a specific communication partner device ofcharging device 20. Similarly, a mechanism for ensuring that batterypack 10 mounted in a specific mounting slot of vehicle 30 is required tobe identical to battery pack 10 of a specific communication partnerdevice of vehicle 30. In the present exemplary embodiment, the identitybetween battery pack 10 physically connected and battery pack 10connected by wireless communication is confirmed by identificationinformation (ID). The identification information (ID) may be temporalidentification information. The identification information (ID) mayinclude identification information unique to each device.

FIG. 2 is a diagram illustrating a configuration example of chargingdevice 20 according to the exemplary embodiment. Charging device 20includes charging stand 21, controller 22, display unit 27, operationunit 28, and charging unit 29. Controller 22 includes at leastprocessing unit 23, antenna 25, and wireless communication unit 26.

Charging stand 21 has plural charging slots SLc1 to SLc8 in which pluralbattery packs 10 are mounted, respectively. In the example illustratedin FIG. 2 , the number of charging slots is eight. The number ofcharging slots may be two or more, and may be four, for example.

Each of charging slots SLc1 to SLc8 includes a connector including apositive electrode terminal and a negative electrode terminal. Whenbattery pack 10 is mounted, the charging slots are electricallyconducted to a positive electrode terminal and a negative electrodeterminal included in the connector of battery pack 10, respectively. Thenegative electrode terminal included in the connector of each ofcharging slots SLc1 to SLc8 and the negative electrode terminal includedin the connector of battery pack 10 may be solid grounds. In this case,pins included in the connector of battery pack 10 may be integrated withone of positive electrode terminal pins, and the number of projectionportions of the connector with defect may be reduced.

Processing unit 13 (see FIG. 4 ) of each battery pack 10 mounted incharging stand 21 transmits and receives a control signal to and fromprocessing unit 23 in controller 22 via the near-field communication anda power line. A specific method for transmitting and receiving thecontrol signal between the processing units will be described later.

The positive electrode terminal and the negative electrode terminal ofeach of charging slots SLc1 to SLc8 are connected to a positiveelectrode terminal and a negative electrode terminal of charging unit29, respectively. Charging unit 29 is connected to commercial powersystem 2, and is configured to charge battery pack 10 mounted incharging stand 21. Charging unit 29 generates direct-current (DC) powerby performing full-wave rectifying of alternating-current (AC) powersupplied from commercial power system 2 and smoothing the rectified ACpower with a filter.

Relays (not illustrated) are provided between the positive electrodeterminal and the negative electrode terminal of charging unit 29 and thepositive electrode terminal and the negative electrode terminal of eachof charging slots SLc1 to SLc8. Processing unit 23 controls controlconduction or interruption of each of charging slots SLc1 to SLc8 bycontrolling turning on (closing) and turning off (opening) of eachrelay.

A DC/DC converter (not illustrated) may be provided between the positiveelectrode terminal and the negative electrode terminal of charging unit29 and the positive electrode terminal and the negative electrodeterminal of each of charging slots SLc1 to SLc8. In this case,processing unit 23 controls a charging voltage or a charging current ofeach battery pack 10 by controlling the DC/DC converter. For example,constant current (CC) charging or constant voltage (CV) charging can beperformed. The DC/DC converter may be provided in battery pack 10. Whenan AC/DC converter is mounted in battery pack 10, battery pack 10 may becharged with AC power from charging unit 29.

Processing unit 23 is, for example, a microcomputer. Wirelesscommunication unit 26 executes a near-field communication process. Inthe present exemplary embodiment, wireless communication unit 26includes a BLE module, and antenna 25 includes a chip antenna built inthe BLE module or a pattern antenna. Wireless communication unit 26outputs data received via near-field communication to processing unit23, and transmits data input from processing unit 23 via near-fieldcommunication.

Processing unit 23 may acquire battery state information from batterypack 10 mounted in charging stand 21. At least one of voltage, current,temperature, state of charge (SOC), and state of health (SOH) of pluralcells E1 to En (see FIG. 4 ) in battery pack 10 can be acquired as thebattery state information.

Display unit 27 includes a display, and displays guidance to the user(usually, the driver of vehicle 30) who uses charging device 20 on thedisplay. Operation unit 28 is a user interface such as a touch panel,and accepts an operation from the user. Charging device 20 may furtherinclude a loudspeaker (not illustrated) and may output audio guidancefrom the loudspeaker to the user.

FIG. 3 is a diagram illustrating a configuration example of vehicle 30according to the exemplary embodiment. Vehicle 30 includes batterymounting unit 31, vehicle controller 32, meter panel 39, inverter 310,motor 311, and tire 312. Vehicle controller 32 includes at leastprocessing unit 33, antenna 35, and wireless communication unit 36.

Battery mounting unit 31 has at least one of mounting slots SLa1 andSLa2 for mounting at least one battery pack 10. In the exampleillustrated in FIG. 3 , although the number of mounting slots is two,the number of mounting slots may be one or three or more.

Each of mounting slots SLa1 and SLa2 includes a connector including apositive electrode terminal and a negative electrode terminal, and whenbattery pack 10 is mounted, the mounting slots are electricallyconducted to the positive electrode terminal and the negative electrodeterminal included in the connector of battery pack 10, respectively. Thenegative electrode terminal portion included in the connector of each ofmounting slots SLa1 and SLa2 may be a solid GND.

Processing unit 13 (see FIG. 4 ) of each battery pack 10 mounted inbattery mounting unit 31 transmits and receives a control signal to andfrom processing unit 33 in vehicle controller 32 via near-fieldcommunication and a power line. A specific method for transmitting andreceiving the control signal between the processing units will bedescribed later.

The plural positive electrode terminals of the plural mounting slotsSLa1 and SLa2 are connected to a positive-side power bus, and the pluralnegative electrode terminals are connected to a negative-side power bus.Therefore, the plural battery packs 10 mounted in the plural mountingslots SLa1 and SLa2 are electrically connected in parallel to oneanother. Therefore, as the number of battery packs 10 mounted in batterymounting unit 31 increases, the capacity increases. The plural batterypacks 10 mounted in the plural mounting slots SLa1 and SLa2 may beelectrically connected in series to one another. In this case, an outputvoltage is increased.

A positive electrode terminal and a negative electrode terminal ofbattery mounting unit 31 are connected to a positive electrode terminaland a negative electrode terminal of inverter 310, respectively, viamain relay RYm. Main relay RYm functions as a contactor between vehicle30 and battery pack 10. Processing unit 33 controls conduction orinterruption between vehicle 30 and battery pack 10 by controllingturning on and off of main relay RYm.

Inverter 310 converts DC power supplied from battery pack 10 mounted inbattery mounting unit 31 into AC power and supplies the AC power tomotor 311 at the time of power running. The inverter converts AC powersupplied from motor 311 into DC power and supplies the DC power tobattery pack 10 mounted in battery mounting unit 31 at the time ofregeneration. Motor 311 is a three-phase AC motor, and rotates inaccordance with the AC power supplied from inverter 310 at the time ofpower running. At the time of regeneration, the motor convertsrotational energy created by deceleration into AC power and supplies theAC power to inverter 310. A rotary shaft of motor 311 is coupled to arotary shaft of tire 312 of a rear wheel. A transmission may be providedbetween the rotary shaft of motor 311 and the rotary shaft of tire 312.

Vehicle controller 32 is a vehicle electronic controller (ECU)configured to control entire vehicle 30. Processing unit 33 of vehiclecontroller 32 includes a microcomputer. Wireless communication unit 36executes a near-field communication process. In the present exemplaryembodiment, wireless communication unit 36 includes a BLE module, andantenna 35 includes a chip antenna built in the BLE module or a patternantenna. Wireless communication unit 36 outputs data received vianear-field communication to processing unit 33, and transmits data inputfrom processing unit 33 via the near-field communication.

Processing unit 33 may acquire battery state information from batterypack 10 mounted in battery mounting unit 31. Information of at least oneof voltage, current, temperature, SOC, and SOH of plural cells E1 to En(see FIG. 4 ) in battery pack 10 can be acquired as the battery stateinformation. Processing unit 33 may acquire a speed of vehicle 30.

Meter panel 39 displays state information of vehicle 30. For example,the speed of vehicle 30 and the state of charge (SOC) of battery pack 10are displayed. The driver may determine the necessity of replacement ofbattery pack 10 by looking at the state of charge (SOC) of battery pack10 displayed on meter panel 39.

FIG. 4 is a diagram illustrating a system configuration example ofbattery pack 10 mounted in vehicle 30 and vehicle controller 32according to the exemplary embodiment. In the example illustrated inFIG. 4 , two battery packs 10 a and 10 b are mounted in battery mountingunit 31 of vehicle 30 (see FIG. 3 ).

Battery pack 10 includes battery module 11 and battery controller 12.Battery module 11 is connected on a power line internally connectingpositive electrode terminal Tp to negative electrode terminal Tm ofbattery pack 10. Positive electrode terminal Tp of battery pack 10 isconnected to the positive-side power bus via slot relay RYs, andnegative electrode terminal Tm of battery pack 10 is connected to thenegative-side power bus. The positive-side power bus and thenegative-side power bus are connected to inverter 310 via main relay RYm(see FIG. 3 ).

Battery module 11 includes plural cells E1 to En connected in series toone another. Battery module 11 may include plural battery modulesconnected in series to one another or in series and parallel to oneanother. Each cell may be a lithium ion battery cell, a nickel metalhydride battery cell, a lead battery cell, or the like. Hereinafter, inthis specification, the description is made by assuming an example wherea lithium ion battery cell (having a nominal voltage of 3.6 V to 3.7 V)is used as the cell. The number of cells E1 to En is determined inaccordance with a drive voltage of motor 311.

A communication path is branched from node N1 between positive electrodeterminal Tp of battery pack 10 and battery module 11. Power relay RYp isinserted between node N1 and battery module 11. Current sensor 17 isinstalled on the power line internally connecting positive electrodeterminal Tp to negative electrode terminal Tm of battery pack 10.Current sensor 17 is installed at a position closer to negativeelectrode terminal Tm than power relay RYp. Current sensor 17 isconfigured to measure a current flowing through battery module 11, andoutputs the measured current value to processing unit 13 of batterycontroller 12. Current sensor 17 may include, for example, a combinationof a shunt resistor, a differential amplifier, and an A/D converter. AHall element may be used in place of the shunt resistor.

Battery controller 12 includes processing unit 13, voltage measurementunit 14, antenna 15, and wireless communication unit 16. Voltagemeasurement unit 14 is connected via plural voltage measurement lines tonodes between plural cells E1 to En, connected in series to one another.Voltage measurement unit 14 is configured to measure voltages of cellsE1 to En by measuring each voltage between two adjacent voltagemeasurement lines. Voltage measurement unit 14 transmits the measuredvoltages of cells E1 to En to processing unit 13.

Voltage measurement unit 14 has a higher voltage than processing unit 13and hence, voltage measurement unit 14 is connected to processing unit13 via a communication line while voltage measurement unit 14 isinsulated from processing unit 13. Voltage measurement unit 14 can beimplemented by an application specific integrated circuit (ASIC) or ageneral-purpose analog front-end IC. Voltage measurement unit 14includes a multiplexer and an A/D converter. The multiplexer outputs avoltage between two adjacent voltage measurement lines to the A/Dconverter in order from the top. The A/D converter converts analogvoltages input from the multiplexer into digital values.

While not illustrated in FIG. 4 , at least one temperature sensor isinstalled near plural cells E1 to En. The temperature sensor measuresthe temperatures of cells E1 to En, and outputs the measuredtemperatures to processing unit 13. The temperature sensor may include,for example, a combination of a thermistor, a voltage dividing resistor,and an A/D converter.

In the case that an A/D converter is mounted in processing unit 13 andan analog input port is installed in processing unit 13, output valuesof current sensor 17 and the temperature sensor can be input, as analogvalues, to processing unit 13.

Fitting detector 18 is configured to detect a fitting state between theconnector of battery pack 10 and the connector of battery mounting unit31 of vehicle 30. For example, the connector of battery pack 10 may be afemale connector, and the connector of battery mounting unit 31 ofvehicle 30 may be a male connector. Fitting detector 18 outputsactivation signals corresponding to connection states of both theconnectors to processing unit 13. The activation signal is defined by abinary signal: an ON signal output while both the connectors areconnected to each other; and an OFF signal output while both theconnectors are separated to each other. Fitting detector 18 may beimplemented by, for example, a reed switch. In this case, fittingdetector 18 magnetically determines whether both the connectors areconnected to each other or not. The fitting detector may be implementedby a sensor configured to mechanically detect the presence or absence ofconnection between both the connectors may be used.

Wireless communication unit 16 executes a near-field communicationprocess. In the present exemplary embodiment, wireless communicationunit 16 includes a BLE module, and antenna 15 includes a chip antennabuilt in the BLE module or a pattern antenna. Wireless communicationunit 16 is configured to output, to processing unit 13, data receivedvia near-field communication, and to transmit, via near-fieldcommunication, data input from processing unit 13.

Node N1 between positive electrode terminal Tp of battery pack 10 andbattery module 11 is connected to processing unit 13 via a communicationpath. Fuse F1, resistor R1, and pack-side communication relay RYc areconnected in series to one another on the communication path. Fuse F1 isa protector preventing an overcurrent from flowing into processing unit13 from the power line.

Processing unit 13 includes a microcomputer. Processing unit 13 isactivated when the activation signal input from fitting detector 18 isturned on, and is shut down when the activation signal is turned off.Instead of shutdown, transition to a standby state or a sleep state maybe performed.

Processing unit 13 controls conduction or interruption of thecommunication path between node N1 and processing unit 13 by controllingturning on and off of pack-side communication relay RYc. Processing unit13 is configured to control states of cells E1 to En based on thevoltage values, the current values, and the temperature values of thecells E1 to En measured by voltage measurement unit 14, current sensor17, and the temperature sensor. For example, when overvoltage,undervoltage, overcurrent, high-temperature anomaly, or low-temperatureanomaly occurs, processing unit 13 turns off power relay RYp to protectthe cells E1 to En.

Processing unit 13 is configured to estimate the SOCs and the SOHs ofcells E1 to En. Processing unit 13 is configured to estimate the SOCs byan open circuit voltage (OCV) method or a current integration method.The SOH is defined as a ratio of a current full charge capacity to aninitial full charge capacity. The SOH having a lower value (closer to0%) indicates that degradation progresses more. The SOH may be obtainedby measuring the capacity through full charging and discharging, or maybe obtained by adding storage degradation and cycle degradation. Thestorage degradation may be estimated based on the SOC, the temperature,and a storage degradation rate. The cycle degradation may be estimatedbased on a range of the SOC in which the battery pack is used, atemperature, a current rate, and a cycle degradation rate. The storagedegradation rate and the cycle degradation rate may be previouslyderived by experiments or simulations. The SOC, the temperature, therange of the range of the SOC, and the current rate may be obtained bymeasurement.

The SOH may be estimated based on a correlation between the SOH and aninternal resistance of a cell. The internal resistance may be estimatedby dividing, by the current value, a voltage drop that occurs when apredetermined current flows through the cell for a predetermined time.The internal resistance decreases as the temperature rises, andincreases as the SOH decreases.

In the system configuration example illustrated in FIG. 4 , vehiclecontroller 32 includes processing unit 33, relay controller 34, antenna35, wireless communication unit 36, and pack detector 37. Relaycontroller 34 is configured to control turning on and off of main relayRYm, first slot relay RYsa, and second slot relay RYsb in response to aninstruction from processing unit 33.

Node Na between positive electrode terminal Tp of first battery pack 10a and first slot relay RYsa is connected to processing unit 33 ofvehicle controller 32 via a communication path. Fuse F2 a and firstvehicle-side communication relay RYca are connected in series to eachother on the communication path. Processing unit 33 controls conductionor interruption of the communication path between node Na and processingunit 33 by controlling turning on and off of first vehicle-sidecommunication relay RYca.

Similarly, node Nb between positive electrode terminal Tp of secondbattery pack 10 b and second slot relay RYsb is connected to processingunit 33 of vehicle controller 32 via a communication path. Fuse F2 b andsecond vehicle-side communication relay RYcb are connected in series toeach other on the communication path. Processing unit 33 controlsconduction or interruption of the communication path between node Nb andprocessing unit 33 by controlling turning on and off of secondvehicle-side communication relay RYcb.

In the case that three or more mounting slots are provided in batterymounting unit 31 of vehicle 30, three or more slot relays RYs and threeor more communication paths (fuse F2 and vehicle-side communicationrelay RYc) are provided in parallel.

First fitting detector 38 a detects a fitting state between theconnector of first mounting slot SLa1 of battery mounting unit 31 andthe connector of first battery pack 10 a, and outputs to pack detector37 a detection signal indicating that these connectors are fitted.Similarly, second fitting detector 38 b detects a fitting state betweenthe connector of second mounting slot SLa2 of battery mounting unit 31and the connector of second battery pack 10 b, and outputs to packdetector 37 a detection signal indicating that these connectors arefitted. First fitting detector 38 a and second fitting detector 38 b maydetect whether or not the connectors of the mounting slots are connectedto the connectors of battery pack 10 by a magnetic method or amechanical method.

Pack detector 37 outputs to processing unit 33 activation signalscorresponding to detection signals input from fitting detectors 38 a and38 b. When at least one of the detection signals indicates theconnection state, pack detector 37 outputs an activation signalincluding a slot number of the connection state. When all of thedetection signals indicate disconnection states, pack detector 37controls the activation signal such that the activation signal is in anoff state.

In an ignition-on state, processing unit 33 is activated when theactivation signal input from pack detector 37 indicates that at leastone battery pack 10 is mounted, and is shut down when the activationsignal is turned off. Instead of shutdown, transition to a standby stateor a sleep state may be performed.

In the system configuration example described above, processing unit 33of vehicle controller 32 may transmit and receive a control signal toand from processing unit 13 of battery controller 12 via near-fieldcommunication.

Processing unit 33 of vehicle controller 32 may transmit and receive thecontrol signal to and from processing unit 13 of battery controller 12wiredly, i.e., via a wired path. When communication with processing unit13 of first battery pack 10 a is wiredly performed, processing unit 33of vehicle controller 32 turns off first slot relay RYsa and turns onfirst vehicle-side communication relay RYca. Processing unit 13 of firstbattery pack 10 a turns off power relay RYp and turns on pack-sidecommunication relay RYc of first battery pack 10 a. In this state, thewired path between processing unit 33 of vehicle controller 32 andprocessing unit 13 of first battery pack 10 a is electrically conductedwhile being insulated from vehicle 30 and a high-voltage unit of batterypack 10. Therefore, serial communication may be performed betweenprocessing unit 33 of vehicle controller 32 and processing unit 13 offirst battery pack 10 a at a voltage (for example, less than or equal toa voltage of 5V) corresponding to an operating voltage of the processingunit.

Similarly, when communication with processing unit 13 of second batterypack 10 b is performed wiredly, via a wire, processing unit 33 ofvehicle controller 32 turns off second slot relay RYsb and turns onsecond vehicle-side communication relay RYcb. Processing unit 13 ofsecond battery pack 10 b turns off power relay RYp and turns onpack-side communication relay RYc in second battery pack 10 b. In thisstate, the wired path between processing unit 33 of vehicle controller32 and processing unit 13 of second battery pack 10 b is electricallyconducted while being insulated from vehicle 30 and the high-voltageunit of battery pack 10.

While not illustrated in FIG. 2 , the same configuration as vehiclecontroller 32 illustrated in FIG. 4 is also provided in controller 22 ofcharging device 20. Processing unit 23 of charging device 20 maytransmit and receive a control signal to and from processing unit 13 ofbattery controller 12 via near-field communication. Processing unit 23of charging device 20 may transmit and receive the control signal to andfrom processing unit 13 of battery controller 12 wiredly, via a wiredpath.

FIG. 5 is a diagram illustrating a basic concept of a process ofauthenticating, by vehicle controller 32, battery pack 10 mounted inmounting slot SLa of vehicle 30. Vehicle controller 32 is basicallyconfigured to identify battery pack 10 by searching for a radio wave ofthe near-field communication transmitted from battery pack 10.Specifically, when battery pack 10 is mounted in mounting slot SLa,vehicle controller 32 wiredly transmits ID1. Upon wiredly receiving theID1 from vehicle controller 32, battery controller 12 of battery pack 10transmits a signal including the ID1 via near-field communication.

Upon receiving the signal via the near-field communication, vehiclecontroller 32 collates the ID included in the received signal with ID1previously transmitted wiredly. When both the IDs match, vehiclecontroller 32 authenticates that battery pack 10 mounted in mountingslot SLa is identical to a partner device communicating via thenear-field communication. When both the IDs do not match, vehiclecontroller 32 determines that the partner device communicating via thenear-field communication is not identical to battery pack 10 mounted inmounting slot SLa, and does not authenticate battery pack 10 of thepartner device. For example, when a signal including ID2 is received,since the ID does not match ID1 transmitted wiredly, battery pack 10which has transmitted the signal including the ID2 is not authenticated.

Vehicle controller 32 may determine identity between battery pack 10mounted in mounting slot SLa and the partner device communicating viathe near-field communication by transmitting the ID via the near-fieldcommunication and collating the transmitted ID with the ID receivedwiredly from battery controller 12 of battery pack 10.

A basic concept of the process of authenticating, by vehicle controller32, battery pack 10 mounted in mounting slot SLa of vehicle 30 has beendescribed above, the same is applicable to a case where controller 22 ofcharging device 20 authenticates battery pack 10 mounted in chargingslot SLc of charging device 20.

FIG. 6 is a diagram schematically illustrating a flow of ID assignmentto battery pack 10 after replacement when battery pack 10 mounted inmounting slot SLa of vehicle 30 is replaced. In state 1, first chargingslot SLc1 of charging device 20 is an empty slot, and charged secondbattery pack 10 b is mounted in second charging slot SLc2. First batterypack 10 a having a reduced state of charge is mounted in first mountingslot SLa1 of vehicle 30. First battery pack 10 a includes a vehicle IDauthenticated by vehicle controller 32. The vehicle ID ensures theidentity between first battery pack 10 a as a physical connectionpartner device and first battery pack 10 a as a connection partnerdevice of wireless communication as viewed from vehicle 30.

In state 2, the user (usually, the driver of vehicle 30) detaches firstbattery pack 10 a from first mounting slot SLa1 of vehicle 30, anddetached first battery pack 10 a is mounted in first charging slot SLc1of charging device 20. When first battery pack 10 a is rented, a work ofreturning first battery pack 10 a to charging device 20 is performed.When first battery pack 10 a is mounted in first charging slot SLc1 ofcharging device 20, battery controller 12 of first battery pack 10 atransmits the vehicle ID retained therein to controller 22 of chargingdevice 20.

In state 3, controller 22 of charging device 20 transmits, to batterycontroller 12 of second battery pack 10 b, the vehicle ID received frombattery controller 12 of first battery pack 10 a, and writes the vehicleID to battery controller 12 of second battery pack 10 b.

In state 4, the user detaches second battery pack 10 b from secondcharging slot SLc2 of charging device 20, and detached second batterypack 10 b is mounted in first mounting slot SLa1 of vehicle 30. Batterypack 10 mounted in first mounting slot SLa1 of vehicle 30 is thusphysically replaced. Since second battery pack 10 b already has thevehicle ID, identity between second battery pack 10 b as a physicalconnection partner device and second battery pack 10 b as a partnerdevice communicating wirelessly as viewed from vehicle 30 is secured.

FIG. 7 is a sequence diagram illustrating a detailed process flow whenbattery pack 10 mounted in mounting slot SLa of vehicle 30 is replaced(part 1). FIG. 8 is a sequence diagram illustrating a detailed processflow when battery pack 10 mounted in mounting slot SLa of vehicle 30 isreplaced (part 2). In horizontal lines in the following sequencediagrams, thin dotted lines denote wireless communication, thin solidlines denote wired communication, thick dotted lines denote physicalmovement of the battery pack, and thick solid lines denote charging anddischarging of battery packs.

First charging slot SLc1 of charging device 20 is an empty slot, andsecond battery pack 10 b is mounted in second charging slot SLc2. Secondbattery pack 10 b includes a charging ID1 authenticated by controller 22of charging device 20. The charging ID1 ensures identity between secondbattery pack 10 b as a physical connection partner device and secondbattery pack 10 b as a partner device communicating wirelessly as viewedfrom charging device 20.

Charging device 20 charges second battery pack 10 b mounted in secondcharging slot SLc2. That is, a charging current flows from charging unit29 to second battery pack 10 b mounted in second charging slot SLc2.When the SOC of second battery pack 10 b reaches an upper limit value,the charging is ended. The upper limit value may be an SOC correspondingto a full charge capacity or an SOC lower than the full charge capacity(for example, 90%).

First battery pack 10 a is mounted in first mounting slot SLa1 ofvehicle 30. First battery pack 10 a includes a vehicle ID authenticatedby vehicle controller 32. The vehicle ID ensures identity between firstbattery pack 10 a as a physical connection partner device and firstbattery pack 10 a as a connection partner device of wirelesscommunication as viewed from vehicle 30. While vehicle 30 travels, adischarge current flows from first battery pack 10 a to motor 311 viainverter 310. The SOC of first battery pack 10 a decreases as vehicle 30travels.

When an ignition-off operation is performed by the user (usually, thedriver of vehicle 30), vehicle controller 32 accepts the ignition-offoperation (P3 a). Upon accepting the ignition off operation, vehiclecontroller 32 transmits a shutdown instruction to battery controller 12of first battery pack 10 a via near-field communication. Upon receivingthe shutdown instruction from vehicle controller 32, battery controller12 of first battery pack 10 a is shut down (P3 b).

After first battery pack 10 a is unmounted from first mounting slot SLa1of vehicle 30 by the user and first battery pack 10 a is mounted infirst charging slot SLc1 of charging device 20, fitting detector 18 offirst battery pack 10 a detects the fitting in first charging slot SLc1(P3 c), and battery controller 12 of first battery pack 10 a isactivated (P3 e). Controller 22 of charging device 20 detects thatbattery pack 10 is mounted in first charging slot SLc1 (P3 d).

Battery controller 12 of first battery pack 10 a notifies, of thevehicle ID, controller 22 of charging device 20 wiredly (P3 f). Thenotification of the vehicle ID may be performed by copying or moving thevehicle ID. In a case where the notification is performed by moving thevehicle ID, battery controller 12 of first battery pack 10 a notifiescontroller 22 of charging device 20 of the vehicle ID, and deletes thevehicle ID from battery controller 12 of first battery pack 10 a.

Controller 22 of charging device 20 wiredly transmits a charging ID2 tobattery controller 12 of first battery pack 10 a mounted in firstcharging slot SLc1, and writes the charging ID2 to battery controller 12of first battery pack 10 a (P3 g). When battery controller 12 of firstbattery pack 10 a receives the charging ID2, battery controller 12serves as a beacon terminal (peripheral terminal) and executesadvertising via near-field communication (P3 h). Specifically, batterycontroller 12 transmits periodically at constant intervals anadvertisement packet including the charging ID2 received wiredly, as abeacon packet. The advertisement packet functions as a signal fornotifying controller 22 of charging device 20 as the central terminal orvehicle controller 32 of vehicle 30 of the presence of the host vehicle.

Upon receiving the advertisement packet, controller 22 of chargingdevice 20 collates the charging ID included in the receivedadvertisement packet with the charging ID previously transmitted wiredly(P3 i). In the example illustrated in FIG. 7 , when the charging IDincluded in the received advertisement packet is the charging ID2, thecollation succeeds. When the charging ID is not the charging ID2, thecollation does not succeed, thus failing.

When the collation fails, controller 22 of charging device 20 continuesscanning of the advertisement packet. When the collation succeeds,controller 22 of charging device 20 starts a connection process to beconnected to battery controller 12 of first battery pack 10 a (P3 j).

First, controller 22 of charging device 20 transmits a connectionrequest to battery controller 12 of first battery pack 10 a.Subsequently, encryption parameters (for example, the number of digitsof an encryption key and an encryption level) are exchanged betweencontroller 22 of charging device 20 and battery controller 12 of firstbattery pack 10 a. Battery controller 12 of first battery pack 10 agenerates an encryption key used to encrypt communication data based onthe exchanged encryption parameter (P3 k). Controller 22 of chargingdevice 20 generates an encryption key used to encrypt the communicationdata based on the exchanged encryption parameter (P3 l). Finally, thegenerated encryption keys are exchanged between controller 22 ofcharging device 20 and battery controller 12 of first battery pack 10 a.As a result, pairing between controller 22 of charging device 20 andbattery controller 12 of first battery pack 10 a is completed (P3 m).The completion of the pairing completes a process of returning firstbattery pack 10 a to charging device 20.

Controller 22 of charging device 20 selects another battery pack 10 withwhich first battery pack 10 a is replaced (P3 n). Specifically,controller 22 of charging device 20 selects one of charged battery packs10 mounted in the charging slots SLc of charging stand 21. In theexample illustrated in FIG. 7 , charged second battery pack 10 b mountedin second charging slot SLc2 is selected.

Controller 22 of charging device 20 wiredly transmits, to batterycontroller 12 of selected second battery pack 10 b, the vehicle ID whichhas been acquired from battery controller 12 of first battery pack 10 a,and writes the vehicle ID to battery controller 12 of second batterypack 10 b (P3 o).

Controller 22 of charging device 20 transmits a shutdown instruction tobattery controller 12 of selected second battery pack 10 b vianear-field communication, and executes a disconnection process to bedisconnected from battery controller 12 of second battery pack 10 b (P3p). Upon receiving the shutdown instruction from controller 22 ofcharging device 20, battery controller 12 of second battery pack 10 b isshut down (P3 q). Battery controller 12 of second battery pack 10 btransmits a shutdown completion notification to controller 22 ofcharging device 20 immediately before being shut down.

Upon receiving the shutdown completion notification from batterycontroller 12 of second battery pack 10 b, controller 22 of chargingdevice 20 instructs the user of vehicle 30 to detach second battery pack10 b mounted in second charging slot SLc2 (P3 r). For example,controller 22 of charging device 20 causes display unit 27 to display amessage instructing the user to detach second battery pack 10 b mountedin second charging slot SLc2. At this moment, controller 22 of chargingdevice 20 may output audio guidance from a loudspeaker (not illustrated)to the user. Only a lamp (not illustrated) of second charging slot SLc2may be turned on or off. Only a lamp (not illustrated) of secondcharging slot SLc2 may be turned on in a color different from color ofthe lamp of the other charging slot.

When second battery pack 10 b is detached from second charging slot SLc2and second battery pack 10 b is mounted in first mounting slot SLa1 ofvehicle 30 by the user, fitting detector 18 of second battery pack 10 bdetects fitting to first mounting slot SLa1 (P3 s), and batterycontroller 12 of second battery pack 10 b is activated (P3 u). Whenfitting detector 38 of vehicle 30 detects that battery pack 10 ismounted in first mounting slot SLa1 (P3 t), vehicle controller 32 isactivated (P3 v).

Controller 22 of charging device 20 starts charging control of firstbattery pack 10 a mounted in first charging slot SLc1 (P3 w).Specifically, controller 22 of charging device 20 transmits a charginginstruction to battery controller 12 of first battery pack 10 a vianear-field communication, and turns on second slot relay RYsb. Uponreceiving the charging instruction, battery controller 12 of firstbattery pack 10 a turns on power relay RYp. As a result, a chargingcurrent flows from charging unit 29 of charging device 20 to firstbattery pack 10 a mounted in first charging slot SLc1.

Battery controller 12 of second battery pack 10 b serves as a beaconterminal and executes advertising via near-field communication (P3 z).Specifically, battery controller 12 transmits periodically at constantintervals, as a beacon packet, an advertisement packet including thevehicle ID written by controller 22 of charging device 20.

Upon receiving the advertisement packet, vehicle controller 32 collatesthe vehicle ID included in the received advertisement packet with thevehicle ID assigned to first battery pack 10 a (P3A). When the collationof the vehicle ID fails, vehicle controller 32 continues scanning of theadvertisement packet. When the collation of the vehicle IDs succeeds,vehicle controller 32 starts a connection process to be connected tobattery controller 12 of second battery pack 10 b (P3B).

First, vehicle controller 32 transmits a connection request to batterycontroller 12 of second battery pack 10 b. Subsequently, encryptionparameters are exchanged between vehicle controller 32 and batterycontroller 12 of second battery pack 10 b. Battery controller 12 ofsecond battery pack 10 b generates an encryption key used to encrypt thecommunication data based on the exchanged encryption parameter (P3C).Vehicle controller 32 generates an encryption key used to encryptcommunication data based on the exchanged encryption parameter (P3D).Finally, the generated encryption keys are exchanged between vehiclecontroller 32 and battery controller 12 of second battery pack 10 b,thereby completing a pairing between vehicle controller 32 and batterycontroller 12 of second battery pack 10 b (P3E). After the pairing iscompleted, vehicle controller 32 transmits a shutdown instruction tobattery controller 12 of second battery pack 10 b via near-fieldcommunication. Upon receiving the shutdown instruction from vehiclecontroller 32, battery controller 12 of second battery pack 10 b is shutdown (P3F).

FIG. 9 is a sequence diagram illustrating a process flow according to amodification of the process illustrated in FIG. 8 . In the modificationillustrated in FIG. 9 , a mechanism for enhancing the reliability of theauthentication process by vehicle controller 32 of battery pack 10mounted in first mounting slot SLa1 is introduced. Hereinafter,differences from the process illustrated in FIG. 8 will be described.

When battery controller 12 of second battery pack 10 b is activated inprocess P3 u and vehicle controller 32 is activated in process P3 v,vehicle controller 32 wiredly transmits the vehicle ID assigned to firstbattery pack 10 a to battery controller 12 of second battery pack 10 b,and writes the vehicle ID to battery controller 12 of second batterypack 10 b (P3 x).

Upon wiredly receiving the vehicle ID from vehicle controller 32,battery controller 12 of second battery pack 10 b collates the vehicleID received from vehicle controller 32 with the vehicle ID written bycontroller 22 of charging device 20 (P3 y). Battery controller 12 ofsecond battery pack 10 b wiredly transmits the collation result tovehicle controller 32. When the collation fails, battery controller 12of second battery pack 10 b transitions to a standby mode. Vehiclecontroller 32 displays, on meter panel 39, a warning that incorrectbattery pack 10 is mounted in first mounting slot SLa1. After visuallyconfirming the displayed warning, the user returns incorrectly mountedbattery pack 10 to charging device 20, detaches correct battery pack 10from charging device 20, and mounts the detached battery pack to firstmounting slot SLa1. When new battery pack 10 is mounted in firstmounting slot SLa1, the process returns to process P3 s and process P3t.

In this modification, a process of wiredly transmitting the vehicle IDfrom vehicle controller 32 to battery controller 12 of battery pack 10is added. This process prevents vehicle controller 32 and batterycontroller 12 of battery pack 10 mounted in adjacent vehicle 30 frombeing incorrectly paired.

As described above, in the present exemplary embodiment, when batterypack 10 mounted in vehicle 30 is detached and returned to chargingdevice 20, the vehicle ID in battery pack 10 is written to antherbattery pack 10 for replacement via charging device 20. As a result,when battery pack 10 for replacement is mounted in vehicle 30, vehicle30 correctly identifies mounted battery pack 10 based on the vehicle ID.This configuration provides no malfunction, such as erroneous control ofbattery pack 10 mounted in another nearby vehicle 30 by vehiclecontroller 32 of certain vehicle 30, and secures the safety and securityof entire vehicle system 1 using replaceable battery pack 10 andcharging device 20. The user safely drives vehicle 30 only by detachingbattery pack 10 mounted in charging device 20 and mounting the batterypack in vehicle 30.

Since the vehicle ID in battery pack 10 returned to charging device 20is written to another battery pack 10 for replacement via chargingdevice 20 and reused, vehicle 30 that can use battery pack 10 forreplacement is limited to vehicle 30 in which returned battery pack 10is mounted. This configuration prevents the use of illegally acquiredbattery pack 10 (for example, stolen battery pack 10).

The control signals are transmitted and received between battery pack 10and each of vehicle 30 and charging device 20 via near-fieldcommunication. This configuration reduces the number of pins included inthe connector of battery pack 10. As a result, it is possible to reducea mechanical connection failure between battery pack 10 and each ofvehicle 30 and charging device 20. Firmware used in battery controller12 of battery pack 10 can be updated via wireless communication, and thefirmware can be easily updated.

The present disclosure has been described above according to theexemplary embodiment. It will be understood by those who are skilled inart that the exemplary embodiment is merely an example, thatcombinations of constituent elements and processes included in theexemplary embodiment may be modified in various forms, and that suchmodifications are also within the scope of the present disclosure.

The above-described exemplary embodiment has described an example ofusing battery pack 10 incorporating battery module 11 including thelithium ion battery cell, the nickel hydrogen battery cell, the leadbattery cell, or the like. In this regard, a capacitor packincorporating a capacitor module including an electric double layercapacitor cell, a lithium ion capacitor cell, or the like may be used.In this specification, the battery pack and the capacitor pack arecollectively referred to as a power storage pack. Each relay in theabove-described exemplary embodiment may be appropriately replaced witha semiconductor switch.

In the above-described exemplary embodiment, an electric motorcycle(electric scooter) is assumed as vehicle 30 using replaceable batterypack 10 as a power source. In this respect, vehicle 30 may be anelectric bicycle. Vehicle 30 may be a four-wheeled electric automobile(EV). The electric automobile includes not only a full-standard electricautomobile but also a low-speed electric automobile such as a golf cartor a land car used in a shopping mall or an entertainment facility.

An electric movable body using replaceable battery pack 10 as a powersource is not limited to vehicle 30. For example, the electric movablebody also includes an electric ship. For example, a power source of awater bus or a water taxi may be replaceable battery pack 10. Theelectric movable body also includes a train. For example, a train onwhich replaceable battery pack 10 is mounted can be used instead of adiesel train used in a non-electrified route. The electric movable bodyalso includes an electric flying object. The electric flight objectincludes a multi-copter (drone). The multi-copter includes a so-calledflying car. Any electric movable body can shorten an energy supply time.

The exemplary embodiment may be specified by the following items.

[Item 1]

A power storage pack (10) authentication method includes the followingsteps. A controller (12) of a first power storage pack (10 a) wiredlytransmits identification information retained in the first power storagepack (10 a) to a controller (22) of a charging device (20) when thefirst power storage pack (10 a) detached from an electric movable body(30) is mounted in a first charging slot (SLc1) of the charging device(20). The controller (22) of the charging device (20) wiredly transmitsthe identification information received from the first power storagepack (10 a) to a controller (12) of a second power storage pack (10 b)which is replaceable with the first power storage pack (10 a) and whichis mounted in a second charging slot (SLc2). The controller (12) of thesecond power storage pack (10 b) transmits via near-field communicationa signal including the identification information received from thecharging device (20) when the second power storage pack (10 b) detachedfrom the second charging slot (SLc2) is mounted in the electric movablebody (30). A controller (32) of the electric movable body (30) collateswhether or not the identification information included in the receivedsignal matches the identification information retained in the firstpower storage pack (10 a) after the controller (32) of the electricmovable body (30) receives the signal transmitted by the near-fieldcommunication, and authenticates that the second power storage pack (10b) mounted in the electric movable body (30) is identical to a partnerdevice communicating via the near-field communication when theidentification information included in the received signal matches theidentification information retained in the first power storage pack (10a).

In the above method, controller (32) of electric movable body (30)accurately authenticates whether or not mounted second power storagepack (10 b) is identical to the partner device communicating via thenear-field communication.

[Item 2]

The power storage pack authentication method according to item 1 mayfurther include the following steps. The controller (32) of the electricmovable body (30) wiredly transmits the identification informationretained in the first power storage pack (10 a) to the controller (12)of the second power storage pack (10 b) mounted in the electric movablebody (30) before the controller (12) of the second power storage pack(10 b) transmits the signal including the identification informationreceived from the charging device (20) after the second power storagepack (10 b) detached from the second charging slot (SLc2) is mounted inthe electric movable body (30). The controller (12) of the second powerstorage pack (10 b) collates the identification information receivedfrom the charging device (20) with identification information receivedfrom the electric movable body (30), and wiredly transmits a result ofsaid collating to the controller (32) of the electric movable body (30).The controller (12) of the second power storage pack (10 b) suspendssaid transmitting via the near-field communication the signal includingthe identification information received from the charging device (20)when the result of said collating is that the identification informationreceived from the charging device (20) does not match the identificationinformation received from the electric movable body (30).

The above controller (32) of electric movable body (30) reliablyauthenticates whether or not mounted second power storage pack (10 b) isidentical to the partner device communicating via the near-fieldcommunication.

[Item 3]

The power storage pack authentication method according to item 1 or 2,may further include: after the controller (22) of the charging device(20) receives identification information from the first power storagepack (10 a) mounted in the first charging slot (SLc1), transmittingwiredly, by the controller (22) of the charging device (20), anotheridentification information to the controller (12) of the first powerstorage pack (10 a); transmitting via near-field communication, by thecontroller (12) of the first power storage pack (10 a), a signalincluding the another identification information received from thecharging device (20); and after the controller (22) of the chargingdevice (20) receives the signal transmitted via the near-fieldcommunication, collating, by the controller (22) of the charging device(20), whether or not the identification information included in thereceived signal matches the another identification informationtransmitted wiredly, and authenticating that the first power storagepack (10 a) mounted in the first charging slot (SLc1) is identical to apartner device communicating via the near-field communication when theidentification information included in the received signal matches theanother identification information transmitted wiredly.

The above controller (22) of charging device (20) accuratelyauthenticates whether or not the partner communicating via thenear-field communication is identical to first power storage pack (10 a)mounted in first charging slot (SLc1).

[Item 4]

The power storage pack authentication method according to any one ofitems 1 to 3, wherein the near-field communication may be Bluetooth® LowEnergy (BLE).

The near-field communication may be performed with low powerconsumption.

[Item 5]

A power storage pack (10) includes: a power storage unit (11) configuredto supply electric power to an electric movable body (30); and acontroller (12) configured to communicate with a controller (32) of theelectric movable body (30) and a controller (22) of a charging device(20). The controller (12) is configured to: wiredly transmitidentification information retained in the power storage pack to thecontroller (22) of the charging device (20) after the power storage packis detached from the electric movable body (30) and is mounted in acharging slot of the charging device (20); wiredly receive anotheridentification information from the controller (22) of the chargingdevice (20) after a charging of the power storage pack is completed, theanother identification information being received by the controller (22)of the charging device (20) from another power storage pack mounted inanother charging slot; and transmit via near-field communication asignal including the another identification information received fromthe charging device (20) after the power storage pack is detached fromthe charging slot and is mounted in the electric movable body (30). Thesignal transmitted via the near-field communication is utilized by thecontroller (32) of the electric movable body (30) for the controller(32) of the electric movable body (30) to authenticate whether or notthe power storage pack mounted in the electric movable body (30) isidentical to a partner device communicating via the near-fieldcommunication.

The above controller (32) of electric movable body (30) accuratelyauthenticates whether or not mounted power storage pack (10) isidentical to the partner device communicating via the near-fieldcommunication.

[Item 6]

In the power storage pack (10) according to item 5, the controller (12)may be configured to: wiredly receive identification informationretained in the another power storage pack from the controller (32) ofthe electric movable body (30) before transmitting via the near-fieldcommunication the signal including the another identificationinformation received from the charging device (20) after the powerstorage pack is mounted in the electric movable body (30); collate theidentification information received from the charging device (20) withthe identification information received from the electric movable body(30), and wiredly transmit a collation result to the electric movablebody (30); and suspend the transmitting, via the near-fieldcommunication, of the signal including the another identificationinformation received from the charging device (20) when the collationinformation is that the identification information received from thecharging device (20) does not match the identification informationreceived from the electric movable body (30).

The above controller (32) of electric movable body (30) reliablyauthenticates whether or not mounted power storage pack (10) isidentical to the partner device communicating via the near-fieldcommunication.

[Item 7]

A charging device (20) includes: a plurality of charging slots; and acontroller (22) configured to communicate with a controller (12) of apower storage pack (10). The controller (22) is configured to: wiredlyreceives identification information retained in a first power storagepack (10 a) from a controller (12) of the first power storage pack (10a) after the first power storage pack (10 a) detached from an electricmovable body (30) is mounted in a first charging slot (SLc1); wiredlytransmit the identification information received from the first powerstorage pack (10 a) to a controller (12) of a second power storage pack(10 b) which is replaceable with the first power storage pack (10 a) andwhich is mounted in a second charging slot (SLc2); wiredly transmitanother identification information to the controller (12) of the firstpower storage pack (10 a) mounted in the first charging slot (SLc1);after receiving a signal transmitted via near-field communication,collate whether or not the identification information included in thereceived signal matches the another identification informationtransmitted wiredly; and authenticate that the first power storage pack(10 a) mounted in the first charging slot (SLc1) is identical to apartner device communicating via the near-field communication if theidentification information included in the received signal matches theanother identification information transmitted wiredly.

The above controller (22) of charging device (20) accuratelyauthenticates whether or not the partner device communicating via thenear-field communication is identical to first power storage pack (10 a)mounted in first charging slot (SLc1).

[Item 8]

An electric movable body (30) includes a motor and a controller (32)configured to communicate with a controller (12) of a power storage pack(10). The controller (32) is configured after receiving a signal vianear-field communication after a first power storage pack (10 a) isdetached from the electric movable body (30) and is mounted in a firstcharging slot (SLc1) of a charging device (20) and after a second powerstorage pack (10 b) replaceable with the first power storage pack (10 a)is detached from a second charging slot (SLc2) of the charging device(20) and is mounted in the electric movable body (30), to: collatewhether or not identification information included in the receivedsignal matches identification information retained in the first powerstorage pack (10 a); and authenticate that the second power storage pack(10 b) mounted in the electric movable body (30) is identical to apartner device communicating via the near-field communication when theidentification information included in the received signal matchesidentification information retained in the first power storage pack (10a).

The above controller (32) of electric movable body (30) accuratelyauthenticates whether or not mounted second power storage pack (10 b) isidentical to the partner device communicating via the near-fieldcommunication.

[Item 9]

In the electric movable body (30) according to item 8, the controller(32) is configured to: wiredly transmit the identification informationretained in the first power storage pack (10 a) to a controller (12) ofthe second power storage pack (10 b) after the second power storage pack(10 b) is mounted in the electric movable body (30); and wiredly receivefrom the controller (12) of the second power storage pack (10 b) acollation result obtained by collating, by the controller (12) of thesecond power storage pack (10 b), the identification informationreceived from the charging device (20) with the identificationinformation received from the electric movable body (30).

The above controller (32) of electric movable body (30) reliablyauthenticates whether or not mounted second power storage pack (10 b) isidentical to the partner device communicating via the near-fieldcommunication.

[Item 10]

In a controller (32) of an electric movable body (30), the controller(32) of the electric movable body (30) is configured, after receiving asignal via near-field communication after the first power storage pack(10 a) is detached from the electric movable body (30) and is mounted ina first charging slot (SLc1) of the charging device (20) and after asecond power storage pack (10 b) replaceable with the first powerstorage pack (10 a) is detached from a second charging slot (SLc2) ofthe charging device (20) is mounted in the electric movable body (30),to: collate whether or not identification information included in thereceived signal matches identification information retained in the firstpower storage pack (10 a); and authenticate that the second powerstorage pack (10 b) mounted in the electric movable body (30) isidentical to a partner device communicating via the near-fieldcommunication when the identification information included in thereceived signal matches identification information retained in the firstpower storage pack (10 a).

The above controller of the electric movable body (30) accuratelyauthenticates whether or not second power storage pack (10 b) mounted inelectric movable body (30) is identical to the partner devicecommunicating via the near-field communication.

REFERENCE MARKS IN THE DRAWINGS

1 vehicle system

2 commercial power system

10 battery pack

11 battery module

E1-En cell

12 battery controller

13 processing unit

14 voltage measurement unit

15 antenna

16 wireless communication unit

17 current sensor

18 fitting detector

20 charging device

21 charging stand

SLc charging slot

22 controller

23 processing unit

25 antenna

26 wireless communication unit

27 display unit

28 operation unit

29 charging unit

30 vehicle

31 battery mounting unit

SLa mounting slot

32 vehicle controller

33 processing unit

34 relay controller

35 antenna

36 wireless communication unit

37 pack detector

38 fitting detector

39 meter panel

310 inverter

311 motor

312 tire

RYm main relay

RYsa first slot relay

RYsb second slot relay

RYp power relay

RYc pack-side communication relay

RYca first vehicle-side communication relay

RYcb second vehicle-side communication relay

F2 fuse

R2 resistor

Tp positive-electrode terminal

Tm negative-electrode terminal

1. A power storage pack authentication method comprising: wiredlytransmitting, by a controller of a first power storage pack,identification information retained in the first power storage pack to acontroller of a charging device when the first power storage packdetached from an electric movable body is mounted in a first chargingslot of the charging device; wiredly transmitting, by the controller ofthe charging device, the identification information received from thefirst power storage pack to a controller of a second power storage packwhich is replaceable with the first power storage pack and which ismounted in a second charging slot; transmitting via near-fieldcommunication, by the controller of the second power storage pack, asignal including the identification information received from thecharging device when the second power storage pack detached from thesecond charging slot is mounted in the electric movable body; andcollating, by a controller of the electric movable body, whether or notthe identification information included in the received signal matchesthe identification information retained in the first power storage packafter the controller of the electric movable body receives the signaltransmitted by the near-field communication, and authenticating that thesecond power storage pack mounted in the electric movable body isidentical to a partner device communicating via the near-fieldcommunication when the identification information included in thereceived signal matches the identification information retained in thefirst power storage pack.
 2. The power storage pack authenticationmethod according to claim 1, further comprising: wiredly transmitting,by the controller of the electric movable body, the identificationinformation retained in the first power storage pack to the controllerof the second power storage pack mounted in the electric movable bodybefore the controller of the second power storage pack transmits thesignal including the identification information received from thecharging device after the second power storage pack detached from thesecond charging slot is mounted in the electric movable body; andcollating, by the controller of the second power storage pack, theidentification information received from the charging device withidentification information received from the electric movable body, andwiredly transmitting a result of said collating to the controller of theelectric movable body, wherein the controller of the second powerstorage pack suspends said transmitting via the near-field communicationthe signal including the identification information received from thecharging device when the result of said collating is that theidentification information received from the charging device does notmatch the identification information received from the electric movablebody.
 3. The power storage pack authentication method according to claim1, further comprising: after the controller of the charging devicereceives identification information from the first power storage packmounted in the first charging slot, transmitting wiredly, by thecontroller of the charging device, another identification information tothe controller of the first power storage pack; transmitting vianear-field communication, by the controller of the first power storagepack, a signal including the another identification information receivedfrom the charging device; and after the controller of the chargingdevice receives the signal transmitted via the near-field communication,collating, by the controller of the charging device, whether or not theidentification information included in the received signal matches theanother identification information transmitted wiredly, andauthenticating that the first power storage pack mounted in the firstcharging slot is identical to a partner device communicating via thenear-field communication when the identification information included inthe received signal matches the another identification informationtransmitted wiredly.
 4. The power storage pack authentication methodaccording to claim 1, wherein the near-field communication is Bluetooth®Low Energy (BLE).
 5. A power storage pack comprising: a power storageunit configured to supply electric power to an electric movable body;and a controller configured to communicate with a controller of theelectric movable body and a controller of a charging device, wherein thecontroller is configured to: wiredly transmit identification informationretained in the power storage pack to the controller of the chargingdevice after the power storage pack is detached from the electricmovable body and is mounted in a charging slot of the charging device;wiredly receive another identification information from the controllerof the charging device after a charging of the power storage pack iscompleted, the another identification information being received by thecontroller of the charging device from another power storage packmounted in another charging slot; and transmit via near-fieldcommunication a signal including the another identification informationreceived from the charging device after the power storage pack isdetached from the charging slot and is mounted in the electric movablebody, and the signal transmitted via the near-field communication isutilized by the controller of the electric movable body for thecontroller of the electric movable body to authenticate whether or notthe power storage pack mounted in the electric movable body is identicalto a partner device communicating via the near-field communication. 6.The power storage pack according to claim 5, wherein the controller isconfigured to: wiredly receive identification information retained inthe another power storage pack from the controller of the electricmovable body before transmitting via the near-field communication thesignal including the another identification information received fromthe charging device after the power storage pack is mounted in theelectric movable body; collate the identification information receivedfrom the charging device with the identification information receivedfrom the electric movable body, and wiredly transmit a collation resultto the electric movable body; and suspend the transmitting, via thenear-field communication, of the signal including the anotheridentification information received from the charging device when thecollation information is that the identification information receivedfrom the charging device does not match the identification informationreceived from the electric movable body.
 7. A charging devicecomprising: a plurality of charging slots; and a controller configuredto communicate with a controller of a power storage pack, wherein thecontroller is configured to: wiredly receives identification informationretained in a first power storage pack from a controller of the firstpower storage pack after the first power storage pack detached from anelectric movable body is mounted in a first charging slot; wiredlytransmit the identification information received from the first powerstorage pack to a controller of a second power storage pack which isreplaceable with the first power storage pack and which is mounted in asecond charging slot; wiredly transmit another identificationinformation to the controller of the first power storage pack mounted inthe first charging slot; after receiving a signal transmitted vianear-field communication, collate whether or not the identificationinformation included in the received signal matches the anotheridentification information transmitted wiredly; and authenticate thatthe first power storage pack mounted in the first charging slot isidentical to a partner device communicating via the near-fieldcommunication if the identification information included in the receivedsignal matches the another identification information transmittedwiredly.
 8. An electric movable body comprising: a motor; and acontroller configured to communicate with a controller of a powerstorage pack, wherein the controller is configured, after receiving asignal via near-field communication after a first power storage pack isdetached from the electric movable body and is mounted in a firstcharging slot of a charging device and after a second power storage packreplaceable with the first power storage pack is detached from a secondcharging slot of the charging device and is mounted in the electricmovable body, to: collate whether or not identification informationincluded in the received signal matches identification informationretained in the first power storage pack; and authenticate that thesecond power storage pack mounted in the electric movable body isidentical to a partner device communicating via the near-fieldcommunication when the identification information included in thereceived signal matches identification information retained in the firstpower storage pack.
 9. The electric movable body according to claim 8,wherein the controller is configured to: wiredly transmit theidentification information retained in the first power storage pack to acontroller of the second power storage pack after the second powerstorage pack is mounted in the electric movable body; and wiredlyreceive from the controller of the second power storage pack a collationresult obtained by collating, by the controller of the second powerstorage pack, the identification information received from the chargingdevice with the identification information received from the electricmovable body.
 10. A controller of an electric movable body, wherein thecontroller of the electric movable body is configured after receiving asignal via near-field communication after the first power storage packis detached from the electric movable body and is mounted in a firstcharging slot of the charging device and after a second power storagepack replaceable with the first power storage pack is detached from asecond charging slot of the charging device is mounted in the electricmovable body, to: collate whether or not identification informationincluded in the received signal matches identification informationretained in the first power storage pack; and authenticate that thesecond power storage pack mounted in the electric movable body isidentical to a partner device communicating via the near-fieldcommunication when the identification information included in thereceived signal matches identification information retained in the firstpower storage pack.